Robert Nystrom
67618b0542
Change-Id: I4466165b3ce2b79325a29db2a4d40d7f98f86007 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/149885 Commit-Queue: Bob Nystrom <rnystrom@google.com> Auto-Submit: Bob Nystrom <rnystrom@google.com> Reviewed-by: Nicholas Shahan <nshahan@google.com>
59 lines
1.3 KiB
Dart
59 lines
1.3 KiB
Dart
// TODO(multitest): This was automatically migrated from a multitest and may
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// contain strange or dead code.
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// Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// Verify semantics of the ?. operator when it does not appear on the LHS of an
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// assignment.
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import "package:expect/expect.dart";
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import "conditional_access_helper.dart" as h;
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class B {}
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class C extends B {
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int? v;
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C(this.v);
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static int? staticInt;
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}
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C? nullC() => null;
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main() {
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// Make sure the "none" test fails if property access using "?." is not
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// implemented. This makes status files easier to maintain.
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nullC()?.v;
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// e1?.id is equivalent to ((x) => x == null ? null : x.id)(e1).
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// C?.id is equivalent to C.id.
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{ h.C.staticInt = 1; Expect.equals(1, h.C?.staticInt); }
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// The static type of e1?.d is the static type of e1.id.
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// Let T be the static type of e1 and let y be a fresh variable of type T.
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// Exactly the same static warnings that would be caused by y.id are also
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// generated in the case of e1?.id.
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// '?.' cannot be used to access toplevel properties in libraries imported via
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// prefix.
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// Nor can it be used to access the hashCode getter on the class Type.
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}
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